/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package org.springframework.aop;

import java.lang.reflect.Method;

/**
 * Advice invoked before a method is invoked. Such advices cannot
 * prevent the method call proceeding, unless they throw a
 * Throwable. 
 * @author Rod Johnson
 * @version $Id: MethodBeforeAdvice.java,v 1.3 2004/03/18 02:46:07 trisberg Exp $
 */
public interface MethodBeforeAdvice extends BeforeAdvice {
	
	/**
	 * Callback before a given method is invoked
	 * @param m method being invoked
	 * @param args arguments to the method
	 * @param target target of the method invocation. May be null
	 * @throws Throwable if this object wishes to abort the
	 * call. Any exception thrown will be returned to the caller
	 * if it's allowed by the method signature. Otherwise
	 * the exception will be wrapped as a runtime exception. 
	 */
	void before(Method m, Object[] args, Object target) throws Throwable;

}
